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@uiten gisten, geirrt @fitte Letters .Patent No. 75,862,-datcd'Ma1-ch24,1858; cmtedatcolOctober 18, 1867.

IMPRVBD BLIND-HINGE.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, CHARLES B.. CLARK, of the city of Buialmin thecounty of Erie, and State of New York, have invented a certain new anduseful Improvement in Blind-Hinges and I do hereby declare that thefollowing is a full and exact description thereof, reference being hadto the accompanying drawings, making part of this specicatiom'inwhich-'- Figure l is a view of my improved butt attached to a portion ofthe blind, which is represented as thrown open, showing, in elevation,the back or exterior faces of the former.V

Figure 2 is a detached view, in elevation,of the butt, as it appearsfrom the outside, when the blind is half open, except that thelocking-bar is represented swung-back, in order to better show theconstruction.

Figure 3, a plan of the same closed.

Figure 4, a perspective view of the locking-bar detached. v

Like letters of reference designate corresponding parts in all thefigures.

My invention relatesto that class of'vblind-butts which areself-fastening by means of a gravitating-bar;

` and it consistsin providing the knuckle of the male portion of thehinge with a tiange, which tits in acorraspondiug recess formed inthecontiguous edge of the wing of the female portion, and thereby preventsthe separation of the parts after the blind hasibeen hung; and also inproviding the knuckle of the female portion with an upright shoulder,forming a stop, against which the edge of the Awing of the other halfstrikes, arresting the motion of the blind after it h'asvbeenswung opento the propervposition', all as hereinafter particularly set forth.

In the drawings, A represents the female portion of the'butt, attachedto the window-frame B, C the male portion, attached to the blind, D,-and E the gravitating locking-bar.Y A pi'n or axis, from the portion C,fits and turns with the latter in a hole in the xed portion A, as shownin dotted lines.

The locking-bar E is constructed, as shown in'g. 4, with a boss,f, atits upper end, which rests in a notch in the upper edge 'of the wing gof the portion C, and with a lip, h, which overlaps thel lower edge ofthe wing, (figs. 1 and 2,) and prevents it being detached therefromafter the two parts of the hinge have been put together.

The knuckle of the stationary portion of the butt is provided with acam-projection, z', (tigsnrZ and 3,) while the contiguous portion of thewing g is recessed, (shown-at j,) to allow the wing to pass the cam inopening the shutter, when the bar E, by its gravity, falls betweenthecam and wing, and prevents the closing of the shutter, as representedin fig. 1.` The blind is readily released by swinging the bar back, asshown in iig. 2, when the hinge is free to turn. v 'Y l v A Therstfeature of my invention consists in forming the knuckle of thestationary part of the hinge with a shoulder or stop-face, l, againstwhich the contiguous edge, m, of the movable portion strikes when theshutter has been swungopen to a position parallel with the wall,arresting its further progress, and preventing any play or rattlingbetween the locking-burl and-cam t'. In devices as ordinarilyconstructed, a stop is required to be ailxed to the wall or blind, orthe latter swings around till its edge rests against the wall in aninclined and unsightly position, there being, in such cases, suiieientplay b'etweeil the parts to produce a most disagreeable rattling. Theseobjections it is evident that my improvement entirely overcomes.l

Hitherto various devices have been employed, in connection with thehinge at the upper end of the blind,

lto prevent the removal of the blind by a separationk of the parts ofthe hinge. As a substitute for these arrangements, which areobjectionable, both on account ofthe extra expense, and the difiicultyof attaching or detaching the shutter, owing to the height of the hinge,and the nice adjustment required to 'eiiect the required purpose, Iprovide the knuckle ofthe male portion C with a ange, n, concentric withthe axis of the hinge, and extending partially around the knuckle, asshown in iig. 3. A corresponding notch or recess, o, is made in theadjacent edge of the wingp of the stationary portion, in which this angetits, and thereby, as is readily perceived, prc vents a disconnection ofthe hinge so long as thnsengaged. When the butt is closed, or nearly so,the flange is disengaged from the recess, which allows the easyseparation or connection of its two portions, (fig. 3;) but', when thebutt is attached -to the blind and closed, the upper portion of thewindow-frame, in which'the latter then Ets, prevents its separation,and, when the blind 'is' swung open sufficiently to clear the frame, theiange then becomes engaged in notch o, thus preventing the unhinging ofthe .shutter in any position in which it can he placed, except at thepoint when the shutter clears the frame. I l

In addition to the advantages already enumerated, the shoulder or stop land abutting-portion m notl only prevent the rattling of the blind, andhold it in its proper position, but, by preventing that play or partialswinging back and forth, relieve the hinge of the great strain to whichit would otherwise bc subjected by the action of the wind.

What I claim as'my invention, is- A self-locking blind-butt, whenprovided with flange n, recess o, stop Z, and abutting-portion m,constructed, arranged, and operating substantially in the manner and forthe purposes set forth.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribi ng witnesses. C. B, CLARK.

Witnesses J AY HYATT, ALBERT HAIGHT.

